package com.lqk.netty.simple;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.util.CharsetUtil;

public class NettyClientHandler extends ChannelInboundHandlerAdapter {

    /*
        当通道就绪就会触发该方法
     */
    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        System.out.println("client " + ctx);

        ctx.writeAndFlush(Unpooled.copiedBuffer("hello, server：(>^ω^<)喵", CharsetUtil.UTF_8));
    }

    /*
        当通道有读取事件时，会触发
     */
    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        ByteBuf buf = (ByteBuf) msg;
        System.out.println("服务器回复的消息：" + buf.toString(CharsetUtil.UTF_8));
        System.out.println("服务器的地址：" + ctx.channel().remoteAddress());
    }

    /*
        数据读取完毕的处理
     */
    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
        System.err.println("客户端读取数据完毕");
    }

    /*
        异常发生
     */
    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        cause.printStackTrace();
        ctx.channel().close();
    }
}
